File:Opal in hydrothermally-altered, spherulitic rhyolitic obsidian (Tertiary; mine at Opal Mountain, Clark County, Idaho, USA) 2.jpg - Wikimedia Commons
Opal-AMGL 53372 - Wikidata
Opal - Wikidata
Check this out!! Idaho OPAL fellows have a chance to work with Wiki Education. Classes are from February to October 2023, and areβ¦
File:Opal, Etiopia.jpg - Wikimedia Commons
File:Harlequin Prince Opal.jpg - Wikimedia Commons
File:Opal-255190.jpg - Wikimedia Commons
File:Premium Australian Opal stone.jpg - Wikimedia Commons